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PGA460: 超声波探头的并联电阻电容值是怎么确定的?

Part Number: PGA460

看参考设计电路,在超声波探头上并联了一个电阻和一个电容,这两个器件的值是怎么确定的呢?如果是收发分体探头,接收探头上也需要这样的两个器件吗?